686 SEC. 15. GEOGRAPHY. 



The managing committee nominated by the founders of the society, having 

 carefully considered their plans, and decided on their course of action, both 

 as to the conditions of service and the construction of the first vessel, and 

 being on the point of accomplishing their mission, considered that it -would 

 be interesting to very many persons connected with instruction or voyages to 

 be made acquainted with the programme of this novel enterprise. 



3238. Collection of Models and Maps. 



Frere Alexis,, Gochet. 



3239. Diagrams showing the amount of the Misrepresenta- 

 tion of the Sphere by plane maps in the most usual projections. 



C. W. Merrifteld, F.R.S. 



3240. Lecture Diagrams (4) of Alpine Glaciers, of 



Switzerland, by the late G. V. du Noyer. Used in illustration 

 of lectures at the College of Science. Edward Hull, F.R.S. 



3241. Working Model of a Geyser. 



Prof. W. F. Barrett. 



This is a lecture table arrangement constructed upon the method first 

 suggested by Prof. Wiedemann, and illustrated on a large scale by Prof. 

 Tyndall. Water is put into the tube and heated by a gas flame below. 

 Under the pressure of the column of water, the boiling point is raised, and 

 the pressure being lessened by the overflow of water into the basin, steam 

 is suddenly generated, which ejects the water periodically to a consider- 

 able height. When the tube is cooled, the eruption from this small model 

 can eject the water at least 20 feet high. A large form, on the same pattern, 

 similarly ejects the water 30 or 40 feet high. The size of the larger model is 

 as follows : Tube of galvanised iron, 7 feet long, 4 inches in diameter below, 

 and 2 inches diameter above. Basin, say 4 feet in diameter. A spiral row 

 of gas jets heats this larger tube one-third of the way up, as well as a large 

 gas flame below, 



3242. " Cadre-Mobile." Frame for wall maps and pictures 

 used in schools. Ernest Recordon (Geneva). 



3243. Guthe's School Wall Map of Hanover. Newly 

 drawn by W. Keil. Th. Fischer, Cassel. 



3244. G. Rohifs* Three Months in the Lybian Desert, 



with photograph and map. Th. Fischer, Cassel. 



Kohlf's volume forms the first part of the report on the Expedition for the 

 Investigation of the Libyan Desert, carried out under the auspices of His 

 Highness Ismail Pasha, Khedive of Egypt. 



3245. Album of Printing Specimens. Colour-printing 

 specimens for works by Lischke, von der Decken, Heuglin, Rohlfs, 

 &c. Th. Fischer, Cassel. 



The album contains proofs in colour printing of plates from the geo- 

 graphical and natural history works of Heuglin, Von der Decken, &c. 



3246. Journal of the Museum Godeffroy. 3 vols., 4to. 



F. C. Godeffroy, Hamburg. 



